/**
 * @file
 * Sockets BSD-Like API module
 *
 */

/*
 * Copyright (c) 2001-2004 Swedish Institute of Computer Science.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT
 * SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
 * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
 * OF SUCH DAMAGE.
 *
 * This file is part of the lwIP TCP/IP stack.
 *
 * Author: Adam Dunkels <adam@sics.se>
 *
 * Improved by Marc Boucher <marc@mbsi.ca> and David Haas <dhaas@alum.rpi.edu>
 *
 */

#include "lwip/opt.h"

#if LWIP_SOCKET /* don't build if not configured for use in lwipopts.h */

#include "lwip/sockets.h"
#include "lwip/api.h"
#include "lwip/sys.h"
#include "lwip/igmp.h"
#include "lwip/inet.h"
#include "lwip/tcp.h"
#include "lwip/raw.h"
#include "lwip/udp.h"
#include "lwip/tcpip.h"

#include <string.h>

#define NUM_SOCKETS MEMP_NUM_NETCONN

/** Contains all internal pointers and states used for a socket */
struct lwip_socket {
	/** sockets currently are built on netconns, each socket has one netconn */
	struct netconn* conn;
	/** data that was left from the previous read */
	struct netbuf* lastdata;
	/** offset in the data that was left from the previous read */
	u16_t lastoffset;
	/** number of times data was received, set by event_callback(),
	    tested by the receive and select functions */
	s16_t rcvevent;
	/** number of times data was received, set by event_callback(),
	    tested by select */
	u16_t sendevent;
	/** socket flags (currently, only used for O_NONBLOCK) */
	u16_t flags;
	/** last error that occurred on this socket */
	int err;
};

/** Description for a task waiting in select */
struct lwip_select_cb {
	/** Pointer to the next waiting task */
	struct lwip_select_cb* next;
	/** readset passed to select */
	fd_set* readset;
	/** writeset passed to select */
	fd_set* writeset;
	/** unimplemented: exceptset passed to select */
	fd_set* exceptset;
	/** don't signal the same semaphore twice: set to 1 when signalled */
	int sem_signalled;
	/** semaphore to wake up a task waiting for select */
	sys_sem_t sem;
};

/** This struct is used to pass data to the set/getsockopt_internal
 * functions running in tcpip_thread context (only a void* is allowed) */
struct lwip_setgetsockopt_data {
	/** socket struct for which to change options */
	struct lwip_socket* sock;
	/** socket index for which to change options */
	int s;
	/** level of the option to process */
	int level;
	/** name of the option to process */
	int optname;
	/** set: value to set the option to
	  * get: value of the option is stored here */
	void* optval;
	/** size of *optval */
	socklen_t* optlen;
	/** if an error occures, it is temporarily stored here */
	err_t err;
};

/** The global array of available sockets */
static struct lwip_socket sockets[NUM_SOCKETS];
/** The global list of tasks waiting for select */
static struct lwip_select_cb* select_cb_list;

/** Semaphore protecting the sockets array */
static sys_sem_t socksem;
/** Semaphore protecting select_cb_list */
static sys_sem_t selectsem;

/** Table to quickly map an lwIP error (err_t) to a socket error
  * by using -err as an index */
static const int err_to_errno_table[] = {
	0,             /* ERR_OK          0      No error, everything OK. */
	ENOMEM,        /* ERR_MEM        -1      Out of memory error.     */
	ENOBUFS,       /* ERR_BUF        -2      Buffer error.            */
	ETIMEDOUT,     /* ERR_TIMEOUT    -3      Timeout                  */
	EHOSTUNREACH,  /* ERR_RTE        -4      Routing problem.         */
	ECONNABORTED,  /* ERR_ABRT       -5      Connection aborted.      */
	ECONNRESET,    /* ERR_RST        -6      Connection reset.        */
	ESHUTDOWN,     /* ERR_CLSD       -7      Connection closed.       */
	ENOTCONN,      /* ERR_CONN       -8      Not connected.           */
	EINVAL,        /* ERR_VAL        -9      Illegal value.           */
	EIO,           /* ERR_ARG        -10     Illegal argument.        */
	EADDRINUSE,    /* ERR_USE        -11     Address in use.          */
	-1,            /* ERR_IF         -12     Low-level netif error    */
	-1,            /* ERR_ISCONN     -13     Already connected.       */
	EINPROGRESS    /* ERR_INPROGRESS -14     Operation in progress    */
};

#define ERR_TO_ERRNO_TABLE_SIZE \
  (sizeof(err_to_errno_table)/sizeof(err_to_errno_table[0]))

#define err_to_errno(err) \
  ((unsigned)(-(err)) < ERR_TO_ERRNO_TABLE_SIZE ? \
    err_to_errno_table[-(err)] : EIO)

#ifdef ERRNO
	#ifndef set_errno
		#define set_errno(err) errno = (err)
	#endif
#else
	#define set_errno(err)
#endif

#define sock_set_errno(sk, e) do { \
  sk->err = (e); \
  set_errno(sk->err); \
} while (0)

/* Forward delcaration of some functions */
static void event_callback(struct netconn* conn, enum netconn_evt evt, u16_t len);
static void lwip_getsockopt_internal(void* arg);
static void lwip_setsockopt_internal(void* arg);

/**
 * Initialize this module. This function has to be called before any other
 * functions in this module!
 */
void
lwip_socket_init(void)
{
	socksem   = sys_sem_new(1);
	selectsem = sys_sem_new(1);
}

/**
 * Map a externally used socket index to the internal socket representation.
 *
 * @param s externally used socket index
 * @return struct lwip_socket for the socket or NULL if not found
 */
static struct lwip_socket*
get_socket(int s)
{
	struct lwip_socket* sock;

	if((s < 0) || (s >= NUM_SOCKETS)) {
		LWIP_DEBUGF(SOCKETS_DEBUG, ("get_socket(%d): invalid\n", s));
		set_errno(EBADF);
		return NULL;
	}

	sock = &sockets[s];

	if(!sock->conn) {
		LWIP_DEBUGF(SOCKETS_DEBUG, ("get_socket(%d): not active\n", s));
		set_errno(EBADF);
		return NULL;
	}

	return sock;
}

/**
 * Allocate a new socket for a given netconn.
 *
 * @param newconn the netconn for which to allocate a socket
 * @return the index of the new socket; -1 on error
 */
static int
alloc_socket(struct netconn* newconn)
{
	int i;

	/* Protect socket array */
	sys_sem_wait(socksem);

	/* allocate a new socket identifier */
	for(i = 0; i < NUM_SOCKETS; ++i) {
		if(!sockets[i].conn) {
			sockets[i].conn       = newconn;
			sockets[i].lastdata   = NULL;
			sockets[i].lastoffset = 0;
			sockets[i].rcvevent   = 0;
			sockets[i].sendevent  = 1; /* TCP send buf is empty */
			sockets[i].flags      = 0;
			sockets[i].err        = 0;
			sys_sem_signal(socksem);
			return i;
		}
	}

	sys_sem_signal(socksem);
	return -1;
}

int lwip_get_error(int s)
{
	struct lwip_socket* sock;
	sock = get_socket(s);

	return sock->err;
}

/* Below this, the well-known socket functions are implemented.
 * Use google.com or opengroup.org to get a good description :-)
 *
 * Exceptions are documented!
 */

int
lwip_accept(int s, struct sockaddr* addr, socklen_t* addrlen)
{
	struct lwip_socket* sock, *nsock;
	struct netconn* newconn;
	struct ip_addr naddr;
	u16_t port;
	int newsock;
	struct sockaddr_in sin;
	err_t err;

	LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_accept(%d)...\n", s));
	sock = get_socket(s);

	if(!sock)
		return -1;

	if((sock->flags & O_NONBLOCK) && (sock->rcvevent <= 0)) {
		LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_accept(%d): returning EWOULDBLOCK\n", s));
		sock_set_errno(sock, EWOULDBLOCK);
		return -1;
	}

	newconn = netconn_accept(sock->conn);

	if(!newconn) {
		LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_accept(%d) failed, err=%d\n", s, sock->conn->err));
		sock_set_errno(sock, err_to_errno(sock->conn->err));
		return -1;
	}

	/* get the IP address and port of the remote host */
	err = netconn_peer(newconn, &naddr, &port);

	if(err != ERR_OK) {
		netconn_delete(newconn);
		sock_set_errno(sock, err_to_errno(err));
		return -1;
	}

	/* Note that POSIX only requires us to check addr is non-NULL. addrlen must
	 * not be NULL if addr is valid.
	 */
	if(NULL != addr) {
		LWIP_ASSERT("addr valid but addrlen NULL", addrlen != NULL);
		memset(&sin, 0, sizeof(sin));
		sin.sin_len = sizeof(sin);
		sin.sin_family = AF_INET;
		sin.sin_port = htons(port);
		sin.sin_addr.s_addr = naddr.addr;

		if(*addrlen > sizeof(sin))
			*addrlen = sizeof(sin);

		MEMCPY(addr, &sin, *addrlen);
	}

	newsock = alloc_socket(newconn);

	if(newsock == -1) {
		netconn_delete(newconn);
		sock_set_errno(sock, ENFILE);
		return -1;
	}

	LWIP_ASSERT("invalid socket index", (newsock >= 0) && (newsock < NUM_SOCKETS));
	newconn->callback = event_callback;
	nsock = &sockets[newsock];
	LWIP_ASSERT("invalid socket pointer", nsock != NULL);

	sys_sem_wait(socksem);
	/* See event_callback: If data comes in right away after an accept, even
	 * though the server task might not have created a new socket yet.
	 * In that case, newconn->socket is counted down (newconn->socket--),
	 * so nsock->rcvevent is >= 1 here!
	 */
	nsock->rcvevent += -1 - newconn->socket;
	newconn->socket = newsock;
	sys_sem_signal(socksem);

	LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_accept(%d) returning new sock=%d addr=", s, newsock));
	ip_addr_debug_print(SOCKETS_DEBUG, &naddr);
	LWIP_DEBUGF(SOCKETS_DEBUG, (" port=%"U16_F"\n", port));

	sock_set_errno(sock, 0);
	return newsock;
}

int
lwip_bind(int s, const struct sockaddr* name, socklen_t namelen)
{
	struct lwip_socket* sock;
	struct ip_addr local_addr;
	u16_t local_port;
	err_t err;

	sock = get_socket(s);

	if(!sock)
		return -1;

	LWIP_ERROR("lwip_bind: invalid address", ((namelen == sizeof(struct sockaddr_in)) &&
	           ((((const struct sockaddr_in*)name)->sin_family) == AF_INET)),
	           sock_set_errno(sock, err_to_errno(ERR_ARG)); return -1;);

	local_addr.addr = ((const struct sockaddr_in*)name)->sin_addr.s_addr;
	local_port = ((const struct sockaddr_in*)name)->sin_port;

	LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_bind(%d, addr=", s));
	ip_addr_debug_print(SOCKETS_DEBUG, &local_addr);
	LWIP_DEBUGF(SOCKETS_DEBUG, (" port=%"U16_F")\n", ntohs(local_port)));

	err = netconn_bind(sock->conn, &local_addr, ntohs(local_port));

	if(err != ERR_OK) {
		LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_bind(%d) failed, err=%d\n", s, err));
		sock_set_errno(sock, err_to_errno(err));
		return -1;
	}

	LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_bind(%d) succeeded\n", s));
	sock_set_errno(sock, 0);
	return 0;
}

int
lwip_close(int s)
{
	struct lwip_socket* sock;

	LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_close(%d)\n", s));

	sock = get_socket(s);

	if(!sock) {
		return -1;
	}

	netconn_delete(sock->conn);

	sys_sem_wait(socksem);

	if(sock->lastdata) {
		netbuf_delete(sock->lastdata);
	}

	sock->lastdata   = NULL;
	sock->lastoffset = 0;
	sock->conn       = NULL;
	sock_set_errno(sock, 0);
	sys_sem_signal(socksem);
	return 0;
}

int
lwip_connect(int s, const struct sockaddr* name, socklen_t namelen)
{
	struct lwip_socket* sock;
	err_t err;

	sock = get_socket(s);

	if(!sock)
		return -1;

	LWIP_ERROR("lwip_connect: invalid address", ((namelen == sizeof(struct sockaddr_in)) &&
	           ((((const struct sockaddr_in*)name)->sin_family) == AF_INET)),
	           sock_set_errno(sock, err_to_errno(ERR_ARG)); return -1;);

	if(((const struct sockaddr_in*)name)->sin_family == AF_UNSPEC) {
		LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_connect(%d, AF_UNSPEC)\n", s));
		err = netconn_disconnect(sock->conn);
	} else {
		struct ip_addr remote_addr;
		u16_t remote_port;

		remote_addr.addr = ((const struct sockaddr_in*)name)->sin_addr.s_addr;
		remote_port = ((const struct sockaddr_in*)name)->sin_port;

		LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_connect(%d, addr=", s));
		ip_addr_debug_print(SOCKETS_DEBUG, &remote_addr);
		LWIP_DEBUGF(SOCKETS_DEBUG, (" port=%"U16_F")\n", ntohs(remote_port)));

		err = netconn_connect(sock->conn, &remote_addr, ntohs(remote_port));
	}

	if(err != ERR_OK) {
		LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_connect(%d) failed, err=%d\n", s, err));
		sock_set_errno(sock, err_to_errno(err));
		return -1;
	}

	LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_connect(%d) succeeded\n", s));
	sock_set_errno(sock, 0);
	return 0;
}

/**
 * Set a socket into listen mode.
 * The socket may not have been used for another connection previously.
 *
 * @param s the socket to set to listening mode
 * @param backlog (ATTENTION: need TCP_LISTEN_BACKLOG=1)
 * @return 0 on success, non-zero on failure
 */
int
lwip_listen(int s, int backlog)
{
	struct lwip_socket* sock;
	err_t err;

	LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_listen(%d, backlog=%d)\n", s, backlog));

	sock = get_socket(s);

	if(!sock)
		return -1;

	/* limit the "backlog" parameter to fit in an u8_t */
	if(backlog < 0) {
		backlog = 0;
	}

	if(backlog > 0xff) {
		backlog = 0xff;
	}

	err = netconn_listen_with_backlog(sock->conn, backlog);

	if(err != ERR_OK) {
		LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_listen(%d) failed, err=%d\n", s, err));
		sock_set_errno(sock, err_to_errno(err));
		return -1;
	}

	sock_set_errno(sock, 0);
	return 0;
}

int
lwip_recvfrom(int s, void* mem, size_t len, int flags,
              struct sockaddr* from, socklen_t* fromlen)
{
	struct lwip_socket* sock;
	struct netbuf*      buf;
	u16_t               buflen, copylen, off = 0;
	struct ip_addr*     addr;
	u16_t               port;
	u8_t                done = 0;

	LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_recvfrom(%d, %p, %"SZT_F", 0x%x, ..)\n", s, mem, len, flags));
	sock = get_socket(s);

	if(!sock)
		return -1;

	do {
		LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_recvfrom: top while sock->lastdata=%p\n", (void*)sock->lastdata));

		/* Check if there is data left from the last recv operation. */
		if(sock->lastdata) {
			buf = sock->lastdata;
		} else {
			/* If this is non-blocking call, then check first */
			if(((flags & MSG_DONTWAIT) || (sock->flags & O_NONBLOCK)) &&
			        (sock->rcvevent <= 0)) {
				if(off > 0) {
					/* already received data, return that */
					sock_set_errno(sock, 0);
					return off;
				}

				LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_recvfrom(%d): returning EWOULDBLOCK\n", s));
				sock_set_errno(sock, EWOULDBLOCK);
				return -1;
			}

			/* No data was left from the previous operation, so we try to get
			some from the network. */
			sock->lastdata = buf = netconn_recv(sock->conn);
			LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_recvfrom: netconn_recv netbuf=%p\n", (void*)buf));

			if(!buf) {
				if(off > 0) {
					/* already received data, return that */
					sock_set_errno(sock, 0);
					return off;
				}

				/* We should really do some error checking here. */
				LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_recvfrom(%d): buf == NULL!\n", s));
				sock_set_errno(sock, (((sock->conn->pcb.ip != NULL) && (sock->conn->err == ERR_OK))
				                      ? ETIMEDOUT : err_to_errno(sock->conn->err)));
				return 0;
			}
		}

		buflen = netbuf_len(buf);
		LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_recvfrom: buflen=%"U16_F" len=%"SZT_F" off=%"U16_F" sock->lastoffset=%"U16_F"\n",
		                            buflen, len, off, sock->lastoffset));

		buflen -= sock->lastoffset;

		if(len > buflen) {
			copylen = buflen;
		} else {
			copylen = (u16_t)len;
		}

		/* copy the contents of the received buffer into
		the supplied memory pointer mem */
		netbuf_copy_partial(buf, (u8_t*)mem + off, copylen, sock->lastoffset);

		off += copylen;

		if(netconn_type(sock->conn) == NETCONN_TCP) {
			LWIP_ASSERT("invalid copylen, len would underflow", len >= copylen);
			len -= copylen;

			if((len <= 0) ||
			        (buf->p->flags & PBUF_FLAG_PUSH) ||
			        (sock->rcvevent <= 0) ||
			        ((flags & MSG_PEEK) != 0)) {
				done = 1;
			}
		} else {
			done = 1;
		}

		/* Check to see from where the data was.*/
		if(done) {
			if(from && fromlen) {
				struct sockaddr_in sin;

				if(netconn_type(sock->conn) == NETCONN_TCP) {
					addr = (struct ip_addr*) & (sin.sin_addr.s_addr);
					netconn_getaddr(sock->conn, addr, &port, 0);
				} else {
					addr = netbuf_fromaddr(buf);
					port = netbuf_fromport(buf);
				}

				memset(&sin, 0, sizeof(sin));
				sin.sin_len = sizeof(sin);
				sin.sin_family = AF_INET;
				sin.sin_port = htons(port);
				sin.sin_addr.s_addr = addr->addr;

				if(*fromlen > sizeof(sin)) {
					*fromlen = sizeof(sin);
				}

				MEMCPY(from, &sin, *fromlen);

				LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_recvfrom(%d): addr=", s));
				ip_addr_debug_print(SOCKETS_DEBUG, addr);
				LWIP_DEBUGF(SOCKETS_DEBUG, (" port=%"U16_F" len=%"U16_F"\n", port, off));
			} else {
#if SOCKETS_DEBUG
				struct sockaddr_in sin;

				if(netconn_type(sock->conn) == NETCONN_TCP) {
					addr = (struct ip_addr*) & (sin.sin_addr.s_addr);
					netconn_getaddr(sock->conn, addr, &port, 0);
				} else {
					addr = netbuf_fromaddr(buf);
					port = netbuf_fromport(buf);
				}

				LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_recvfrom(%d): addr=", s));
				ip_addr_debug_print(SOCKETS_DEBUG, addr);
				LWIP_DEBUGF(SOCKETS_DEBUG, (" port=%"U16_F" len=%"U16_F"\n", port, off));
#endif /*  SOCKETS_DEBUG */
			}
		}

		/* If we don't peek the incoming message... */
		if((flags & MSG_PEEK) == 0) {
			/* If this is a TCP socket, check if there is data left in the
			   buffer. If so, it should be saved in the sock structure for next
			   time around. */
			if((netconn_type(sock->conn) == NETCONN_TCP) && (buflen - copylen > 0)) {
				sock->lastdata = buf;
				sock->lastoffset += copylen;
				LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_recvfrom: lastdata now netbuf=%p\n", (void*)buf));
			} else {
				sock->lastdata = NULL;
				sock->lastoffset = 0;
				LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_recvfrom: deleting netbuf=%p\n", (void*)buf));
				netbuf_delete(buf);
			}
		}
	} while(!done);

	sock_set_errno(sock, 0);
	return off;
}

int
lwip_read(int s, void* mem, size_t len)
{
	return lwip_recvfrom(s, mem, len, 0, NULL, NULL);
}

int
lwip_recv(int s, void* mem, size_t len, int flags)
{
	return lwip_recvfrom(s, mem, len, flags, NULL, NULL);
}

int
lwip_send(int s, const void* data, size_t size, int flags)
{
	struct lwip_socket* sock;
	err_t err;

	LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_send(%d, data=%p, size=%"SZT_F", flags=0x%x)\n",
	                            s, data, size, flags));

	sock = get_socket(s);

	if(!sock)
		return -1;

	if(sock->conn->type != NETCONN_TCP) {
#if (LWIP_UDP || LWIP_RAW)
		return lwip_sendto(s, data, size, flags, NULL, 0);
#else
		sock_set_errno(sock, err_to_errno(ERR_ARG));
		return -1;
#endif /* (LWIP_UDP || LWIP_RAW) */
	}

	err = netconn_write(sock->conn, data, size, NETCONN_COPY | ((flags & MSG_MORE) ? NETCONN_MORE : 0));

	LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_send(%d) err=%d size=%"SZT_F"\n", s, err, size));
	sock_set_errno(sock, err_to_errno(err));
	return (err == ERR_OK ? (int)size : -1);
}

int
lwip_sendto(int s, const void* data, size_t size, int flags,
            const struct sockaddr* to, socklen_t tolen)
{
	struct lwip_socket* sock;
	struct ip_addr remote_addr;
	err_t err;
	u16_t short_size;
#if !LWIP_TCPIP_CORE_LOCKING
	struct netbuf buf;
	u16_t remote_port;
#endif

	sock = get_socket(s);

	if(!sock)
		return -1;

	if(sock->conn->type == NETCONN_TCP) {
#if LWIP_TCP
		return lwip_send(s, data, size, flags);
#else
		sock_set_errno(sock, err_to_errno(ERR_ARG));
		return -1;
#endif /* LWIP_TCP */
	}

	LWIP_ASSERT("lwip_sendto: size must fit in u16_t", size <= 0xffff);
	short_size = (u16_t)size;
	LWIP_ERROR("lwip_sendto: invalid address", (((to == NULL) && (tolen == 0)) ||
	           ((tolen == sizeof(struct sockaddr_in)) &&
	            ((((const struct sockaddr_in*)to)->sin_family) == AF_INET))),
	           sock_set_errno(sock, err_to_errno(ERR_ARG)); return -1;);

#if LWIP_TCPIP_CORE_LOCKING
	/* Should only be consider like a sample or a simple way to experiment this option (no check of "to" field...) */
	{
		struct pbuf* p;

		p = pbuf_alloc(PBUF_TRANSPORT, 0, PBUF_REF);

		if(p == NULL) {
			err = ERR_MEM;
		} else {
			p->payload = (void*)data;
			p->len = p->tot_len = short_size;

			remote_addr.addr = ((const struct sockaddr_in*)to)->sin_addr.s_addr;

			LOCK_TCPIP_CORE();

			if(sock->conn->type == NETCONN_RAW) {
				err = sock->conn->err = raw_sendto(sock->conn->pcb.raw, p, &remote_addr);
			} else {
				err = sock->conn->err = udp_sendto(sock->conn->pcb.udp, p, &remote_addr, ntohs(((const struct sockaddr_in*)to)->sin_port));
			}

			UNLOCK_TCPIP_CORE();

			pbuf_free(p);
		}
	}
#else
	/* initialize a buffer */
	buf.p = buf.ptr = NULL;

	if(to) {
		remote_addr.addr = ((const struct sockaddr_in*)to)->sin_addr.s_addr;
		remote_port      = ntohs(((const struct sockaddr_in*)to)->sin_port);
		buf.addr         = &remote_addr;
		buf.port         = remote_port;
	} else {
		remote_addr.addr = 0;
		remote_port      = 0;
		buf.addr         = NULL;
		buf.port         = 0;
	}

	LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_sendto(%d, data=%p, short_size=%d"U16_F", flags=0x%x to=",
	                            s, data, short_size, flags));
	ip_addr_debug_print(SOCKETS_DEBUG, &remote_addr);
	LWIP_DEBUGF(SOCKETS_DEBUG, (" port=%"U16_F"\n", remote_port));

	/* make the buffer point to the data that should be sent */
#if LWIP_NETIF_TX_SINGLE_PBUF

	/* Allocate a new netbuf and copy the data into it. */
	if(netbuf_alloc(&buf, short_size) == NULL) {
		err = ERR_MEM;
	} else {
		err = netbuf_take(&buf, data, short_size);
	}

#else /* LWIP_NETIF_TX_SINGLE_PBUF */
	err = netbuf_ref(&buf, data, short_size);
#endif /* LWIP_NETIF_TX_SINGLE_PBUF */

	if(err == ERR_OK) {
		/* send the data */
		err = netconn_send(sock->conn, &buf);
	}

	/* deallocated the buffer */
	netbuf_free(&buf);
#endif /* LWIP_TCPIP_CORE_LOCKING */
	sock_set_errno(sock, err_to_errno(err));
	return (err == ERR_OK ? short_size : -1);
}

int
lwip_socket(int domain, int type, int protocol)
{
	struct netconn* conn;
	int i;

	LWIP_UNUSED_ARG(domain);

	/* create a netconn */
	switch(type) {
		case SOCK_RAW:
			conn = netconn_new_with_proto_and_callback(NETCONN_RAW, (u8_t)protocol, event_callback);
			LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_socket(%s, SOCK_RAW, %d) = ",
			                            domain == PF_INET ? "PF_INET" : "UNKNOWN", protocol));
			break;

		case SOCK_DGRAM:
			conn = netconn_new_with_callback((protocol == IPPROTO_UDPLITE) ?
			                                 NETCONN_UDPLITE : NETCONN_UDP, event_callback);
			LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_socket(%s, SOCK_DGRAM, %d) = ",
			                            domain == PF_INET ? "PF_INET" : "UNKNOWN", protocol));
			break;

		case SOCK_STREAM:
			conn = netconn_new_with_callback(NETCONN_TCP, event_callback);
			LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_socket(%s, SOCK_STREAM, %d) = ",
			                            domain == PF_INET ? "PF_INET" : "UNKNOWN", protocol));
			break;

		default:
			LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_socket(%d, %d/UNKNOWN, %d) = -1\n",
			                            domain, type, protocol));
			set_errno(EINVAL);
			return -1;
	}

	if(!conn) {
		LWIP_DEBUGF(SOCKETS_DEBUG, ("-1 / ENOBUFS (could not create netconn)\n"));
		set_errno(ENOBUFS);
		return -1;
	}

	i = alloc_socket(conn);

	if(i == -1) {
		netconn_delete(conn);
		set_errno(ENFILE);
		return -1;
	}

	conn->socket = i;
	LWIP_DEBUGF(SOCKETS_DEBUG, ("%d\n", i));
	set_errno(0);
	return i;
}

int
lwip_write(int s, const void* data, size_t size)
{
	return lwip_send(s, data, size, 0);
}

/**
 * Go through the readset and writeset lists and see which socket of the sockets
 * set in the sets has events. On return, readset, writeset and exceptset have
 * the sockets enabled that had events.
 *
 * exceptset is not used for now!!!
 *
 * @param maxfdp1 the highest socket index in the sets
 * @param readset in: set of sockets to check for read events;
 *                out: set of sockets that had read events
 * @param writeset in: set of sockets to check for write events;
 *                 out: set of sockets that had write events
 * @param exceptset not yet implemented
 * @return number of sockets that had events (read+write)
 */
static int
lwip_selscan(int maxfdp1, fd_set* readset, fd_set* writeset, fd_set* exceptset)
{
	int i, nready = 0;
	fd_set lreadset, lwriteset, lexceptset;
	struct lwip_socket* p_sock;

	FD_ZERO(&lreadset);
	FD_ZERO(&lwriteset);
	FD_ZERO(&lexceptset);

	/* Go through each socket in each list to count number of sockets which
	currently match */
	for(i = 0; i < maxfdp1; i++) {
		if(FD_ISSET(i, readset)) {
			/* See if netconn of this socket is ready for read */
			p_sock = get_socket(i);

			if(p_sock && (p_sock->lastdata || (p_sock->rcvevent > 0))) {
				FD_SET(i, &lreadset);
				LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_selscan: fd=%d ready for reading\n", i));
				nready++;
			}
		}

		if(FD_ISSET(i, writeset)) {
			/* See if netconn of this socket is ready for write */
			p_sock = get_socket(i);

			if(p_sock && p_sock->sendevent) {
				FD_SET(i, &lwriteset);
				LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_selscan: fd=%d ready for writing\n", i));
				nready++;
			}
		}
	}

	*readset = lreadset;
	*writeset = lwriteset;
	FD_ZERO(exceptset);

	return nready;
}


/**
 * Processing exceptset is not yet implemented.
 */
int
lwip_select(int maxfdp1, fd_set* readset, fd_set* writeset, fd_set* exceptset,
            struct timeval* timeout)
{
	int i;
	int nready;
	fd_set lreadset, lwriteset, lexceptset;
	u32_t msectimeout;
	struct lwip_select_cb select_cb;
	struct lwip_select_cb* p_selcb;

	LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_select(%d, %p, %p, %p, tvsec=%ld tvusec=%ld)\n",
	                            maxfdp1, (void*)readset, (void*) writeset, (void*) exceptset,
	                            timeout ? (long)timeout->tv_sec : (long) -1,
	                            timeout ? (long)timeout->tv_usec : (long) -1));

	select_cb.next = 0;
	select_cb.readset = readset;
	select_cb.writeset = writeset;
	select_cb.exceptset = exceptset;
	select_cb.sem_signalled = 0;

	/* Protect ourselves searching through the list */
	sys_sem_wait(selectsem);

	if(readset)
		lreadset = *readset;
	else
		FD_ZERO(&lreadset);

	if(writeset)
		lwriteset = *writeset;
	else
		FD_ZERO(&lwriteset);

	if(exceptset)
		lexceptset = *exceptset;
	else
		FD_ZERO(&lexceptset);

	/* Go through each socket in each list to count number of sockets which
	   currently match */
	nready = lwip_selscan(maxfdp1, &lreadset, &lwriteset, &lexceptset);

	/* If we don't have any current events, then suspend if we are supposed to */
	if(!nready) {
		if(timeout && timeout->tv_sec == 0 && timeout->tv_usec == 0) {
			sys_sem_signal(selectsem);

			if(readset)
				FD_ZERO(readset);

			if(writeset)
				FD_ZERO(writeset);

			if(exceptset)
				FD_ZERO(exceptset);

			LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_select: no timeout, returning 0\n"));
			set_errno(0);

			return 0;
		}

		/* add our semaphore to list */
		/* We don't actually need any dynamic memory. Our entry on the
		 * list is only valid while we are in this function, so it's ok
		 * to use local variables */

		select_cb.sem = sys_sem_new(0);
		/* Note that we are still protected */
		/* Put this select_cb on top of list */
		select_cb.next = select_cb_list;
		select_cb_list = &select_cb;

		/* Now we can safely unprotect */
		sys_sem_signal(selectsem);

		/* Now just wait to be woken */
		if(timeout == 0)
			/* Wait forever */
			msectimeout = 0;
		else {
			msectimeout = ((timeout->tv_sec * 1000) + ((timeout->tv_usec + 500) / 1000));

			if(msectimeout == 0)
				msectimeout = 1;
		}

		if(sys_arch_timeouts() == NULL) {
			/* it's not a lwip thread, use os semaphore with timeout to handle it */
			i = sys_arch_sem_wait(select_cb.sem, msectimeout);

			if(i == SYS_ARCH_TIMEOUT) i = 0;
			else i = 1;
		} else {
			/* it's a lwip thread, use os semaphore with timeout to handle it */
			i = sys_sem_wait_timeout(select_cb.sem, msectimeout);
		}

		/* Take us off the list */
		sys_sem_wait(selectsem);

		if(select_cb_list == &select_cb)
			select_cb_list = select_cb.next;
		else
			for(p_selcb = select_cb_list; p_selcb; p_selcb = p_selcb->next) {
				if(p_selcb->next == &select_cb) {
					p_selcb->next = select_cb.next;
					break;
				}
			}

		sys_sem_signal(selectsem);

		sys_sem_free(select_cb.sem);

		if(i == 0)  {
			/* Timeout */
			if(readset)
				FD_ZERO(readset);

			if(writeset)
				FD_ZERO(writeset);

			if(exceptset)
				FD_ZERO(exceptset);

			LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_select: timeout expired\n"));
			set_errno(0);

			return 0;
		}

		if(readset)
			lreadset = *readset;
		else
			FD_ZERO(&lreadset);

		if(writeset)
			lwriteset = *writeset;
		else
			FD_ZERO(&lwriteset);

		if(exceptset)
			lexceptset = *exceptset;
		else
			FD_ZERO(&lexceptset);

		/* See what's set */
		nready = lwip_selscan(maxfdp1, &lreadset, &lwriteset, &lexceptset);
	} else
		sys_sem_signal(selectsem);

	if(readset)
		*readset = lreadset;

	if(writeset)
		*writeset = lwriteset;

	if(exceptset)
		*exceptset = lexceptset;

	LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_select: nready=%d\n", nready));
	set_errno(0);

	return nready;
}

/**
 * Callback registered in the netconn layer for each socket-netconn.
 * Processes recvevent (data available) and wakes up tasks waiting for select.
 */
static void
event_callback(struct netconn* conn, enum netconn_evt evt, u16_t len)
{
	int s;
	struct lwip_socket* sock;
	struct lwip_select_cb* scb;

	LWIP_UNUSED_ARG(len);

	/* Get socket */
	if(conn) {
		s = conn->socket;

		if(s < 0) {
			/* Data comes in right away after an accept, even though
			 * the server task might not have created a new socket yet.
			 * Just count down (or up) if that's the case and we
			 * will use the data later. Note that only receive events
			 * can happen before the new socket is set up. */
			sys_sem_wait(socksem);

			if(conn->socket < 0) {
				if(evt == NETCONN_EVT_RCVPLUS) {
					conn->socket--;
				}

				sys_sem_signal(socksem);
				return;
			}

			s = conn->socket;
			sys_sem_signal(socksem);
		}

		sock = get_socket(s);

		if(!sock) {
			return;
		}
	} else {
		return;
	}

	sys_sem_wait(selectsem);

	/* Set event as required */
	switch(evt) {
		case NETCONN_EVT_RCVPLUS:
			sock->rcvevent++;
			break;

		case NETCONN_EVT_RCVMINUS:
			sock->rcvevent--;
			break;

		case NETCONN_EVT_SENDPLUS:
			sock->sendevent = 1;
			break;

		case NETCONN_EVT_SENDMINUS:
			sock->sendevent = 0;
			break;

		default:
			LWIP_ASSERT("unknown event", 0);
			break;
	}

	sys_sem_signal(selectsem);

	/* Now decide if anyone is waiting for this socket */
	/* NOTE: This code is written this way to protect the select link list
	   but to avoid a deadlock situation by releasing socksem before
	   signalling for the select. This means we need to go through the list
	   multiple times ONLY IF a select was actually waiting. We go through
	   the list the number of waiting select calls + 1. This list is
	   expected to be small. */
	while(1) {
		sys_sem_wait(selectsem);

		for(scb = select_cb_list; scb; scb = scb->next) {
			if(scb->sem_signalled == 0) {
				/* Test this select call for our socket */
				if(scb->readset && FD_ISSET(s, scb->readset))
					if(sock->rcvevent > 0)
						break;

				if(scb->writeset && FD_ISSET(s, scb->writeset))
					if(sock->sendevent)
						break;
			}
		}

		if(scb) {
			scb->sem_signalled = 1;
			sys_sem_signal(scb->sem);
			sys_sem_signal(selectsem);
		} else {
			sys_sem_signal(selectsem);
			break;
		}
	}
}

/**
 * Unimplemented: Close one end of a full-duplex connection.
 * Currently, the full connection is closed.
 */
int
lwip_shutdown(int s, int how)
{
	LWIP_UNUSED_ARG(how);
	LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_shutdown(%d, how=%d)\n", s, how));
	return lwip_close(s); /* XXX temporary hack until proper implementation */
}

static int
lwip_getaddrname(int s, struct sockaddr* name, socklen_t* namelen, u8_t local)
{
	struct lwip_socket* sock;
	struct sockaddr_in sin;
	struct ip_addr naddr;

	sock = get_socket(s);

	if(!sock)
		return -1;

	memset(&sin, 0, sizeof(sin));
	sin.sin_len = sizeof(sin);
	sin.sin_family = AF_INET;

	/* get the IP address and port */
	netconn_getaddr(sock->conn, &naddr, &sin.sin_port, local);

	LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getaddrname(%d, addr=", s));
	ip_addr_debug_print(SOCKETS_DEBUG, &naddr);
	LWIP_DEBUGF(SOCKETS_DEBUG, (" port=%"U16_F")\n", sin.sin_port));

	sin.sin_port = htons(sin.sin_port);
	sin.sin_addr.s_addr = naddr.addr;

	if(*namelen > sizeof(sin))
		*namelen = sizeof(sin);

	MEMCPY(name, &sin, *namelen);
	sock_set_errno(sock, 0);
	return 0;
}

int
lwip_getpeername(int s, struct sockaddr* name, socklen_t* namelen)
{
	return lwip_getaddrname(s, name, namelen, 0);
}

int
lwip_getsockname(int s, struct sockaddr* name, socklen_t* namelen)
{
	return lwip_getaddrname(s, name, namelen, 1);
}

int
lwip_getsockopt(int s, int level, int optname, void* optval, socklen_t* optlen)
{
	err_t err = ERR_OK;
	struct lwip_socket* sock = get_socket(s);
	struct lwip_setgetsockopt_data data;

	if(!sock)
		return -1;

	if((NULL == optval) || (NULL == optlen)) {
		sock_set_errno(sock, EFAULT);
		return -1;
	}

	/* Do length and type checks for the various options first, to keep it readable. */
	switch(level) {

		/* Level: SOL_SOCKET */
		case SOL_SOCKET:
			switch(optname) {

				case SO_ACCEPTCONN:
				case SO_BROADCAST:

				/* UNIMPL case SO_DEBUG: */
				/* UNIMPL case SO_DONTROUTE: */
				case SO_ERROR:
				case SO_KEEPALIVE:
					/* UNIMPL case SO_CONTIMEO: */
					/* UNIMPL case SO_SNDTIMEO: */
#if LWIP_SO_RCVTIMEO
				case SO_RCVTIMEO:
#endif /* LWIP_SO_RCVTIMEO */
#if LWIP_SO_RCVBUF
				case SO_RCVBUF:
#endif /* LWIP_SO_RCVBUF */
					/* UNIMPL case SO_OOBINLINE: */
					/* UNIMPL case SO_SNDBUF: */
					/* UNIMPL case SO_RCVLOWAT: */
					/* UNIMPL case SO_SNDLOWAT: */
#if SO_REUSE
				case SO_REUSEADDR:
				case SO_REUSEPORT:
#endif /* SO_REUSE */
				case SO_TYPE:

					/* UNIMPL case SO_USELOOPBACK: */
					if(*optlen < sizeof(int)) {
						err = EINVAL;
					}

					break;

				case SO_NO_CHECK:
					if(*optlen < sizeof(int)) {
						err = EINVAL;
					}

#if LWIP_UDP

					if((sock->conn->type != NETCONN_UDP) ||
					        ((udp_flags(sock->conn->pcb.udp) & UDP_FLAGS_UDPLITE) != 0)) {
						/* this flag is only available for UDP, not for UDP lite */
						err = EAFNOSUPPORT;
					}

#endif /* LWIP_UDP */
					break;

				default:
					LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, SOL_SOCKET, UNIMPL: optname=0x%x, ..)\n",
					                            s, optname));
					err = ENOPROTOOPT;
			}  /* switch (optname) */

			break;

		/* Level: IPPROTO_IP */
		case IPPROTO_IP:
			switch(optname) {
				/* UNIMPL case IP_HDRINCL: */
				/* UNIMPL case IP_RCVDSTADDR: */
				/* UNIMPL case IP_RCVIF: */
				case IP_TTL:
				case IP_TOS:
					if(*optlen < sizeof(int)) {
						err = EINVAL;
					}

					break;
#if LWIP_IGMP

				case IP_MULTICAST_TTL:
					if(*optlen < sizeof(u8_t)) {
						err = EINVAL;
					}

					break;

				case IP_MULTICAST_IF:
					if(*optlen < sizeof(struct in_addr)) {
						err = EINVAL;
					}

					break;
#endif /* LWIP_IGMP */

				default:
					LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_IP, UNIMPL: optname=0x%x, ..)\n",
					                            s, optname));
					err = ENOPROTOOPT;
			}  /* switch (optname) */

			break;

#if LWIP_TCP

		/* Level: IPPROTO_TCP */
		case IPPROTO_TCP:
			if(*optlen < sizeof(int)) {
				err = EINVAL;
				break;
			}

			/* If this is no TCP socket, ignore any options. */
			if(sock->conn->type != NETCONN_TCP)
				return 0;

			switch(optname) {
				case TCP_NODELAY:
				case TCP_KEEPALIVE:
#if LWIP_TCP_KEEPALIVE
				case TCP_KEEPIDLE:
				case TCP_KEEPINTVL:
				case TCP_KEEPCNT:
#endif /* LWIP_TCP_KEEPALIVE */
					break;

				default:
					LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_TCP, UNIMPL: optname=0x%x, ..)\n",
					                            s, optname));
					err = ENOPROTOOPT;
			}  /* switch (optname) */

			break;
#endif /* LWIP_TCP */
#if LWIP_UDP && LWIP_UDPLITE

		/* Level: IPPROTO_UDPLITE */
		case IPPROTO_UDPLITE:
			if(*optlen < sizeof(int)) {
				err = EINVAL;
				break;
			}

			/* If this is no UDP lite socket, ignore any options. */
			if(sock->conn->type != NETCONN_UDPLITE)
				return 0;

			switch(optname) {
				case UDPLITE_SEND_CSCOV:
				case UDPLITE_RECV_CSCOV:
					break;

				default:
					LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_UDPLITE, UNIMPL: optname=0x%x, ..)\n",
					                            s, optname));
					err = ENOPROTOOPT;
			}  /* switch (optname) */

			break;
#endif /* LWIP_UDP && LWIP_UDPLITE*/

		/* UNDEFINED LEVEL */
		default:
			LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, level=0x%x, UNIMPL: optname=0x%x, ..)\n",
			                            s, level, optname));
			err = ENOPROTOOPT;
	}  /* switch */


	if(err != ERR_OK) {
		sock_set_errno(sock, err);
		return -1;
	}

	/* Now do the actual option processing */
	data.sock = sock;
	data.level = level;
	data.optname = optname;
	data.optval = optval;
	data.optlen = optlen;
	data.err = err;
	tcpip_callback(lwip_getsockopt_internal, &data);
	sys_arch_sem_wait(sock->conn->op_completed, 0);
	/* maybe lwip_getsockopt_internal has changed err */
	err = data.err;

	sock_set_errno(sock, err);
	return err ? -1 : 0;
}

static void
lwip_getsockopt_internal(void* arg)
{
	struct lwip_socket* sock;
#ifdef LWIP_DEBUG
	int s;
#endif /* LWIP_DEBUG */
	int level, optname;
	void* optval;
	struct lwip_setgetsockopt_data* data;

	LWIP_ASSERT("arg != NULL", arg != NULL);

	data = (struct lwip_setgetsockopt_data*)arg;
	sock = data->sock;
#ifdef LWIP_DEBUG
	s = data->s;
#endif /* LWIP_DEBUG */
	level = data->level;
	optname = data->optname;
	optval = data->optval;

	switch(level) {

		/* Level: SOL_SOCKET */
		case SOL_SOCKET:
			switch(optname) {

				/* The option flags */
				case SO_ACCEPTCONN:
				case SO_BROADCAST:

				/* UNIMPL case SO_DEBUG: */
				/* UNIMPL case SO_DONTROUTE: */
				case SO_KEEPALIVE:
					/* UNIMPL case SO_OOBINCLUDE: */
#if SO_REUSE
				case SO_REUSEADDR:
				case SO_REUSEPORT:
#endif /* SO_REUSE */
					/*case SO_USELOOPBACK: UNIMPL */
					*(int*)optval = sock->conn->pcb.ip->so_options & optname;
					LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, SOL_SOCKET, optname=0x%x, ..) = %s\n",
					                            s, optname, (*(int*)optval ? "on" : "off")));
					break;

				case SO_TYPE:
					switch(NETCONNTYPE_GROUP(sock->conn->type)) {
						case NETCONN_RAW:
							*(int*)optval = SOCK_RAW;
							break;

						case NETCONN_TCP:
							*(int*)optval = SOCK_STREAM;
							break;

						case NETCONN_UDP:
							*(int*)optval = SOCK_DGRAM;
							break;

						default: /* unrecognized socket type */
							*(int*)optval = sock->conn->type;
							LWIP_DEBUGF(SOCKETS_DEBUG,
							            ("lwip_getsockopt(%d, SOL_SOCKET, SO_TYPE): unrecognized socket type %d\n",
							             s, *(int*)optval));
					}  /* switch (sock->conn->type) */

					LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, SOL_SOCKET, SO_TYPE) = %d\n",
					                            s, *(int*)optval));
					break;

				case SO_ERROR:
					if(sock->err == 0) {
						sock_set_errno(sock, err_to_errno(sock->conn->err));
					}

					*(int*)optval = sock->err;
					sock->err = 0;
					LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, SOL_SOCKET, SO_ERROR) = %d\n",
					                            s, *(int*)optval));
					break;

#if LWIP_SO_RCVTIMEO

				case SO_RCVTIMEO:
					*(int*)optval = sock->conn->recv_timeout;
					break;
#endif /* LWIP_SO_RCVTIMEO */
#if LWIP_SO_RCVBUF

				case SO_RCVBUF:
					*(int*)optval = sock->conn->recv_bufsize;
					break;
#endif /* LWIP_SO_RCVBUF */
#if LWIP_UDP

				case SO_NO_CHECK:
					*(int*)optval = (udp_flags(sock->conn->pcb.udp) & UDP_FLAGS_NOCHKSUM) ? 1 : 0;
					break;
#endif /* LWIP_UDP*/
			}  /* switch (optname) */

			break;

		/* Level: IPPROTO_IP */
		case IPPROTO_IP:
			switch(optname) {
				case IP_TTL:
					*(int*)optval = sock->conn->pcb.ip->ttl;
					LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_IP, IP_TTL) = %d\n",
					                            s, *(int*)optval));
					break;

				case IP_TOS:
					*(int*)optval = sock->conn->pcb.ip->tos;
					LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_IP, IP_TOS) = %d\n",
					                            s, *(int*)optval));
					break;
#if LWIP_IGMP

				case IP_MULTICAST_TTL:
					*(u8_t*)optval = sock->conn->pcb.ip->ttl;
					LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_IP, IP_MULTICAST_TTL) = %d\n",
					                            s, *(int*)optval));
					break;

				case IP_MULTICAST_IF:
					((struct in_addr*) optval)->s_addr = sock->conn->pcb.udp->multicast_ip.addr;
					LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_IP, IP_MULTICAST_IF) = 0x%"X32_F"\n",
					                            s, *(u32_t*)optval));
					break;
#endif /* LWIP_IGMP */
			}  /* switch (optname) */

			break;

#if LWIP_TCP

		/* Level: IPPROTO_TCP */
		case IPPROTO_TCP:
			switch(optname) {
				case TCP_NODELAY:
					*(int*)optval = tcp_nagle_disabled(sock->conn->pcb.tcp);
					LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_TCP, TCP_NODELAY) = %s\n",
					                            s, (*(int*)optval) ? "on" : "off"));
					break;

				case TCP_KEEPALIVE:
					*(int*)optval = (int)sock->conn->pcb.tcp->keep_idle;
					LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_IP, TCP_KEEPALIVE) = %d\n",
					                            s, *(int*)optval));
					break;

#if LWIP_TCP_KEEPALIVE

				case TCP_KEEPIDLE:
					*(int*)optval = (int)(sock->conn->pcb.tcp->keep_idle / 1000);
					LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_IP, TCP_KEEPIDLE) = %d\n",
					                            s, *(int*)optval));
					break;

				case TCP_KEEPINTVL:
					*(int*)optval = (int)(sock->conn->pcb.tcp->keep_intvl / 1000);
					LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_IP, TCP_KEEPINTVL) = %d\n",
					                            s, *(int*)optval));
					break;

				case TCP_KEEPCNT:
					*(int*)optval = (int)sock->conn->pcb.tcp->keep_cnt;
					LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_IP, TCP_KEEPCNT) = %d\n",
					                            s, *(int*)optval));
					break;
#endif /* LWIP_TCP_KEEPALIVE */

			}  /* switch (optname) */

			break;
#endif /* LWIP_TCP */
#if LWIP_UDP && LWIP_UDPLITE

		/* Level: IPPROTO_UDPLITE */
		case IPPROTO_UDPLITE:
			switch(optname) {
				case UDPLITE_SEND_CSCOV:
					*(int*)optval = sock->conn->pcb.udp->chksum_len_tx;
					LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_UDPLITE, UDPLITE_SEND_CSCOV) = %d\n",
					                            s, (*(int*)optval)));
					break;

				case UDPLITE_RECV_CSCOV:
					*(int*)optval = sock->conn->pcb.udp->chksum_len_rx;
					LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_getsockopt(%d, IPPROTO_UDPLITE, UDPLITE_RECV_CSCOV) = %d\n",
					                            s, (*(int*)optval)));
					break;
			}  /* switch (optname) */

			break;
#endif /* LWIP_UDP */
	} /* switch (level) */

	sys_sem_signal(sock->conn->op_completed);
}

int
lwip_setsockopt(int s, int level, int optname, const void* optval, socklen_t optlen)
{
	struct lwip_socket* sock = get_socket(s);
	int err = ERR_OK;
	struct lwip_setgetsockopt_data data;

	if(!sock)
		return -1;

	if(NULL == optval) {
		sock_set_errno(sock, EFAULT);
		return -1;
	}

	/* Do length and type checks for the various options first, to keep it readable. */
	switch(level) {

		/* Level: SOL_SOCKET */
		case SOL_SOCKET:
			switch(optname) {

				case SO_BROADCAST:

				/* UNIMPL case SO_DEBUG: */
				/* UNIMPL case SO_DONTROUTE: */
				case SO_KEEPALIVE:
					/* UNIMPL case case SO_CONTIMEO: */
					/* UNIMPL case case SO_SNDTIMEO: */
#if LWIP_SO_RCVTIMEO
				case SO_RCVTIMEO:
#endif /* LWIP_SO_RCVTIMEO */
#if LWIP_SO_RCVBUF
				case SO_RCVBUF:
#endif /* LWIP_SO_RCVBUF */
					/* UNIMPL case SO_OOBINLINE: */
					/* UNIMPL case SO_SNDBUF: */
					/* UNIMPL case SO_RCVLOWAT: */
					/* UNIMPL case SO_SNDLOWAT: */
#if SO_REUSE
				case SO_REUSEADDR:
				case SO_REUSEPORT:
#endif /* SO_REUSE */

					/* UNIMPL case SO_USELOOPBACK: */
					if(optlen < sizeof(int)) {
						err = EINVAL;
					}

					break;

				case SO_NO_CHECK:
					if(optlen < sizeof(int)) {
						err = EINVAL;
					}

#if LWIP_UDP

					if((sock->conn->type != NETCONN_UDP) ||
					        ((udp_flags(sock->conn->pcb.udp) & UDP_FLAGS_UDPLITE) != 0)) {
						/* this flag is only available for UDP, not for UDP lite */
						err = EAFNOSUPPORT;
					}

#endif /* LWIP_UDP */
					break;

				default:
					LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, SOL_SOCKET, UNIMPL: optname=0x%x, ..)\n",
					                            s, optname));
					err = ENOPROTOOPT;
			}  /* switch (optname) */

			break;

		/* Level: IPPROTO_IP */
		case IPPROTO_IP:
			switch(optname) {
				/* UNIMPL case IP_HDRINCL: */
				/* UNIMPL case IP_RCVDSTADDR: */
				/* UNIMPL case IP_RCVIF: */
				case IP_TTL:
				case IP_TOS:
					if(optlen < sizeof(int)) {
						err = EINVAL;
					}

					break;
#if LWIP_IGMP

				case IP_MULTICAST_TTL:
					if(optlen < sizeof(u8_t)) {
						err = EINVAL;
					}

					if(NETCONNTYPE_GROUP(sock->conn->type) != NETCONN_UDP) {
						err = EAFNOSUPPORT;
					}

					break;

				case IP_MULTICAST_IF:
					if(optlen < sizeof(struct in_addr)) {
						err = EINVAL;
					}

					if(NETCONNTYPE_GROUP(sock->conn->type) != NETCONN_UDP) {
						err = EAFNOSUPPORT;
					}

					break;

				case IP_ADD_MEMBERSHIP:
				case IP_DROP_MEMBERSHIP:
					if(optlen < sizeof(struct ip_mreq)) {
						err = EINVAL;
					}

					if(NETCONNTYPE_GROUP(sock->conn->type) != NETCONN_UDP) {
						err = EAFNOSUPPORT;
					}

					break;
#endif /* LWIP_IGMP */

				default:
					LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_IP, UNIMPL: optname=0x%x, ..)\n",
					                            s, optname));
					err = ENOPROTOOPT;
			}  /* switch (optname) */

			break;

#if LWIP_TCP

		/* Level: IPPROTO_TCP */
		case IPPROTO_TCP:
			if(optlen < sizeof(int)) {
				err = EINVAL;
				break;
			}

			/* If this is no TCP socket, ignore any options. */
			if(sock->conn->type != NETCONN_TCP)
				return 0;

			switch(optname) {
				case TCP_NODELAY:
				case TCP_KEEPALIVE:
#if LWIP_TCP_KEEPALIVE
				case TCP_KEEPIDLE:
				case TCP_KEEPINTVL:
				case TCP_KEEPCNT:
#endif /* LWIP_TCP_KEEPALIVE */
					break;

				default:
					LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_TCP, UNIMPL: optname=0x%x, ..)\n",
					                            s, optname));
					err = ENOPROTOOPT;
			}  /* switch (optname) */

			break;
#endif /* LWIP_TCP */
#if LWIP_UDP && LWIP_UDPLITE

		/* Level: IPPROTO_UDPLITE */
		case IPPROTO_UDPLITE:
			if(optlen < sizeof(int)) {
				err = EINVAL;
				break;
			}

			/* If this is no UDP lite socket, ignore any options. */
			if(sock->conn->type != NETCONN_UDPLITE)
				return 0;

			switch(optname) {
				case UDPLITE_SEND_CSCOV:
				case UDPLITE_RECV_CSCOV:
					break;

				default:
					LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_UDPLITE, UNIMPL: optname=0x%x, ..)\n",
					                            s, optname));
					err = ENOPROTOOPT;
			}  /* switch (optname) */

			break;
#endif /* LWIP_UDP && LWIP_UDPLITE */

		/* UNDEFINED LEVEL */
		default:
			LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, level=0x%x, UNIMPL: optname=0x%x, ..)\n",
			                            s, level, optname));
			err = ENOPROTOOPT;
	}  /* switch (level) */


	if(err != ERR_OK) {
		sock_set_errno(sock, err);
		return -1;
	}


	/* Now do the actual option processing */
	data.sock = sock;
	data.level = level;
	data.optname = optname;
	data.optval = (void*)optval;
	data.optlen = &optlen;
	data.err = err;
	tcpip_callback(lwip_setsockopt_internal, &data);
	sys_arch_sem_wait(sock->conn->op_completed, 0);
	/* maybe lwip_setsockopt_internal has changed err */
	err = data.err;

	sock_set_errno(sock, err);
	return err ? -1 : 0;
}

static void
lwip_setsockopt_internal(void* arg)
{
	struct lwip_socket* sock;
#ifdef LWIP_DEBUG
	int s;
#endif /* LWIP_DEBUG */
	int level, optname;
	const void* optval;
	struct lwip_setgetsockopt_data* data;

	LWIP_ASSERT("arg != NULL", arg != NULL);

	data = (struct lwip_setgetsockopt_data*)arg;
	sock = data->sock;
#ifdef LWIP_DEBUG
	s = data->s;
#endif /* LWIP_DEBUG */
	level = data->level;
	optname = data->optname;
	optval = data->optval;

	switch(level) {

		/* Level: SOL_SOCKET */
		case SOL_SOCKET:
			switch(optname) {

				/* The option flags */
				case SO_BROADCAST:

				/* UNIMPL case SO_DEBUG: */
				/* UNIMPL case SO_DONTROUTE: */
				case SO_KEEPALIVE:
					/* UNIMPL case SO_OOBINCLUDE: */
#if SO_REUSE
				case SO_REUSEADDR:
				case SO_REUSEPORT:
#endif /* SO_REUSE */

					/* UNIMPL case SO_USELOOPBACK: */
					if(*(int*)optval) {
						sock->conn->pcb.ip->so_options |= optname;
					} else {
						sock->conn->pcb.ip->so_options &= ~optname;
					}

					LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, SOL_SOCKET, optname=0x%x, ..) -> %s\n",
					                            s, optname, (*(int*)optval ? "on" : "off")));
					break;
#if LWIP_SO_RCVTIMEO

				case SO_RCVTIMEO:
					sock->conn->recv_timeout = (*(int*)optval);
					break;
#endif /* LWIP_SO_RCVTIMEO */
#if LWIP_SO_RCVBUF

				case SO_RCVBUF:
					sock->conn->recv_bufsize = (*(int*)optval);
					break;
#endif /* LWIP_SO_RCVBUF */
#if LWIP_UDP

				case SO_NO_CHECK:
					if(*(int*)optval) {
						udp_setflags(sock->conn->pcb.udp, udp_flags(sock->conn->pcb.udp) | UDP_FLAGS_NOCHKSUM);
					} else {
						udp_setflags(sock->conn->pcb.udp, udp_flags(sock->conn->pcb.udp) & ~UDP_FLAGS_NOCHKSUM);
					}

					break;
#endif /* LWIP_UDP */
			}  /* switch (optname) */

			break;

		/* Level: IPPROTO_IP */
		case IPPROTO_IP:
			switch(optname) {
				case IP_TTL:
					sock->conn->pcb.ip->ttl = (u8_t)(*(int*)optval);
					LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_IP, IP_TTL, ..) -> %d\n",
					                            s, sock->conn->pcb.ip->ttl));
					break;

				case IP_TOS:
					sock->conn->pcb.ip->tos = (u8_t)(*(int*)optval);
					LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_IP, IP_TOS, ..)-> %d\n",
					                            s, sock->conn->pcb.ip->tos));
					break;
#if LWIP_IGMP

				case IP_MULTICAST_TTL:
					sock->conn->pcb.udp->ttl = (u8_t)(*(u8_t*)optval);
					break;

				case IP_MULTICAST_IF:
					sock->conn->pcb.udp->multicast_ip.addr = ((struct in_addr*) optval)->s_addr;
					break;

				case IP_ADD_MEMBERSHIP:
				case IP_DROP_MEMBERSHIP: {
					/* If this is a TCP or a RAW socket, ignore these options. */
					struct ip_mreq* imr = (struct ip_mreq*)optval;

					if(optname == IP_ADD_MEMBERSHIP) {
						data->err = igmp_joingroup((struct ip_addr*) & (imr->imr_interface.s_addr), (struct ip_addr*) & (imr->imr_multiaddr.s_addr));
					} else {
						data->err = igmp_leavegroup((struct ip_addr*) & (imr->imr_interface.s_addr), (struct ip_addr*) & (imr->imr_multiaddr.s_addr));
					}

					if(data->err != ERR_OK) {
						data->err = EADDRNOTAVAIL;
					}
				}
				break;
#endif /* LWIP_IGMP */
			}  /* switch (optname) */

			break;

#if LWIP_TCP

		/* Level: IPPROTO_TCP */
		case IPPROTO_TCP:
			switch(optname) {
				case TCP_NODELAY:
					if(*(int*)optval) {
						tcp_nagle_disable(sock->conn->pcb.tcp);
					} else {
						tcp_nagle_enable(sock->conn->pcb.tcp);
					}

					LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_TCP, TCP_NODELAY) -> %s\n",
					                            s, (*(int*)optval) ? "on" : "off"));
					break;

				case TCP_KEEPALIVE:
					sock->conn->pcb.tcp->keep_idle = (u32_t)(*(int*)optval);
					LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_TCP, TCP_KEEPALIVE) -> %"U32_F"\n",
					                            s, sock->conn->pcb.tcp->keep_idle));
					break;

#if LWIP_TCP_KEEPALIVE

				case TCP_KEEPIDLE:
					sock->conn->pcb.tcp->keep_idle = 1000 * (u32_t)(*(int*)optval);
					LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_TCP, TCP_KEEPIDLE) -> %"U32_F"\n",
					                            s, sock->conn->pcb.tcp->keep_idle));
					break;

				case TCP_KEEPINTVL:
					sock->conn->pcb.tcp->keep_intvl = 1000 * (u32_t)(*(int*)optval);
					LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_TCP, TCP_KEEPINTVL) -> %"U32_F"\n",
					                            s, sock->conn->pcb.tcp->keep_intvl));
					break;

				case TCP_KEEPCNT:
					sock->conn->pcb.tcp->keep_cnt = (u32_t)(*(int*)optval);
					LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_TCP, TCP_KEEPCNT) -> %"U32_F"\n",
					                            s, sock->conn->pcb.tcp->keep_cnt));
					break;
#endif /* LWIP_TCP_KEEPALIVE */

			}  /* switch (optname) */

			break;
#endif /* LWIP_TCP*/
#if LWIP_UDP && LWIP_UDPLITE

		/* Level: IPPROTO_UDPLITE */
		case IPPROTO_UDPLITE:
			switch(optname) {
				case UDPLITE_SEND_CSCOV:
					if((*(int*)optval != 0) && (*(int*)optval < 8)) {
						/* don't allow illegal values! */
						sock->conn->pcb.udp->chksum_len_tx = 8;
					} else {
						sock->conn->pcb.udp->chksum_len_tx = *(int*)optval;
					}

					LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_UDPLITE, UDPLITE_SEND_CSCOV) -> %d\n",
					                            s, (*(int*)optval)));
					break;

				case UDPLITE_RECV_CSCOV:
					if((*(int*)optval != 0) && (*(int*)optval < 8)) {
						/* don't allow illegal values! */
						sock->conn->pcb.udp->chksum_len_rx = 8;
					} else {
						sock->conn->pcb.udp->chksum_len_rx = *(int*)optval;
					}

					LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_setsockopt(%d, IPPROTO_UDPLITE, UDPLITE_RECV_CSCOV) -> %d\n",
					                            s, (*(int*)optval)));
					break;
			}  /* switch (optname) */

			break;
#endif /* LWIP_UDP */
	}  /* switch (level) */

	sys_sem_signal(sock->conn->op_completed);
}

int
lwip_ioctl(int s, long cmd, void* argp)
{
	struct lwip_socket* sock = get_socket(s);
	u16_t buflen = 0;
	s16_t recv_avail;

	if(!sock)
		return -1;

	switch(cmd) {
		case FIONREAD:
			if(!argp) {
				sock_set_errno(sock, EINVAL);
				return -1;
			}

			SYS_ARCH_GET(sock->conn->recv_avail, recv_avail);

			if(recv_avail < 0)
				recv_avail = 0;

			*((u16_t*)argp) = (u16_t)recv_avail;

			/* Check if there is data left from the last recv operation. /maq 041215 */
			if(sock->lastdata) {
				buflen = netbuf_len(sock->lastdata);
				buflen -= sock->lastoffset;

				*((u16_t*)argp) += buflen;
			}

			LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_ioctl(%d, FIONREAD, %p) = %"U16_F"\n", s, argp, *((u16_t*)argp)));
			sock_set_errno(sock, 0);
			return 0;

		case FIONBIO:
			if(argp && *(u32_t*)argp)
				sock->flags |= O_NONBLOCK;
			else
				sock->flags &= ~O_NONBLOCK;

			LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_ioctl(%d, FIONBIO, %d)\n", s, !!(sock->flags & O_NONBLOCK)));
			sock_set_errno(sock, 0);
			return 0;

		default:
			LWIP_DEBUGF(SOCKETS_DEBUG, ("lwip_ioctl(%d, UNIMPL: 0x%lx, %p)\n", s, cmd, argp));
			sock_set_errno(sock, ENOSYS); /* not yet implemented */
			return -1;
	} /* switch (cmd) */
}

#endif /* LWIP_SOCKET */
